Gets signals from eyes as to whether it's light or dark allowing the brain to know when it's time to sleep.
Light = produces protein to stop production of melatonin.
Dark = sends signals to pineal gland.
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Pineal gland
SCN sends a message to pineal gland when it's time to sleep, this gland releases Melatonin.
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Melatonin
Is the hormone the body releases as it gets dark. Makes us feel sleepy.
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Adenosine
Is a chemical that builds up in our neurons during the day. Causes us to feel tired. When we sleep this build up clears and is replaced by glycogen.
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Michel Siffre
Slept in a cave in darkness for several weeks. Circadian rhythms maintained a cycle of just over 24hrs.
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Other cards in this set
Card 2
Front
External cues such as light.
Back
Exogenous cues
Card 3
Front
Internal cues such as the SCN.
Back
Card 4
Front
Gets signals from eyes as to whether it's light or dark allowing the brain to know when it's time to sleep.
Light = produces protein to stop production of melatonin.
Dark = sends signals to pineal gland.
Back
Card 5
Front
SCN sends a message to pineal gland when it's time to sleep, this gland releases Melatonin.
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